CN113567095B - Oxygen supply performance test device of oxygen mask for airplane - Google Patents
Oxygen supply performance test device of oxygen mask for airplane Download PDFInfo
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- CN113567095B CN113567095B CN202110633787.5A CN202110633787A CN113567095B CN 113567095 B CN113567095 B CN 113567095B CN 202110633787 A CN202110633787 A CN 202110633787A CN 113567095 B CN113567095 B CN 113567095B
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Abstract
The invention discloses an oxygen supply performance test device of an oxygen mask for an airplane, which comprises the following components: the device comprises an oxygen mask, a sealing unit, a height simulation unit, a simulated breathing unit, an oxygen supply unit, a sampling unit and a control unit; the height simulation unit is provided with a height simulation cabin; the sealing unit comprises a sealing tool and a leakage quantity regulating valve; the sealing tool and the leakage quantity regulating valve are both arranged in the height simulation cabin; one end of the sealing tool is provided with an opening, and the other end of the sealing tool is provided with three interfaces which are communicated with the inner cavity of the sealing tool, namely an interface A, an interface B and an interface C; the oxygen mask is arranged at the opening end of the sealing tool, so that the oxygen mask and the sealing tool form a gas cavity; the oxygen mask is connected with the oxygen supply unit; the interface A is connected with the simulated breathing unit through a pipeline; the interface B is provided with a leakage quantity regulating valve; the interface C is connected with the sampling unit; the invention can measure the oxygen supply flow required by the oxygen mask when the oxygen mask is at different heights and maintain the safety oxygen partial pressure of passengers, thereby obtaining the performance code of the oxygen mask.
Description
Technical Field
The invention belongs to the technical field of aviation, and particularly relates to an oxygen supply performance test device of an oxygen mask for an airplane.
Background
The aircraft oxygen mask is arranged in the aircraft cabin, and can provide emergency oxygen supply for passengers and crewmembers in the cabin when an emergency occurs, so that the aircraft oxygen mask is a necessary emergency lifesaving device. When the aircraft flies at high altitude, once the pressurized cabin is destroyed in case of emergency, the pressure in the cabin can drop sharply, so that the partial pressure of oxygen in passengers in the cabin drops sharply, and oxygen deficiency occurs and even life safety is endangered.
To maintain the oxygen partial pressure of the passengers' safety, the passengers should be supplied with oxygen in an emergency through an oxygen mask. The oxygen mask is used as the only emergency oxygen supply device, the oxygen flow required to be provided is different under different flying heights, and the oxygen supply flow required when the oxygen mask is measured under different heights and the safety oxygen partial pressure of passengers is kept is particularly important.
Because the oxygen supply performance test is required to be carried out on the newly-developed oxygen mask, the oxygen flow required to be provided for the oxygen mask under different flying heights is obtained, namely, the performance code of the oxygen mask is measured; in the prior art, no disclosed testing device can measure the oxygen supply performance of the oxygen mask, namely the performance code of the oxygen mask cannot be obtained.
Disclosure of Invention
In view of the above, the invention provides an oxygen supply performance test device for an oxygen mask for an aircraft, which can measure the oxygen supply flow required by the oxygen mask when the oxygen mask is at different heights and maintain the safety oxygen partial pressure of passengers, so as to obtain the performance code of the oxygen mask.
The invention is realized by the following technical scheme:
an oxygen supply performance test device for an oxygen mask for an aircraft, comprising: the device comprises an oxygen mask, a sealing unit, a height simulation unit, a simulated breathing unit, an oxygen supply unit, a sampling unit and a control unit;
the height simulation unit is provided with a height simulation cabin and is used for simulating the high-altitude environment of the oxygen supply performance test in the height simulation cabin;
the sealing unit is used for simulating the oral cavity of a human and comprises a sealing tool and a leakage quantity regulating valve; the sealing tool and the leakage quantity regulating valve are both arranged in the height simulation cabin; one end of the sealing tool is provided with an opening, and the other end of the sealing tool is provided with three interfaces communicated with the inner cavity of the sealing tool, wherein the three interfaces are an interface A, an interface B and an interface C respectively; the oxygen mask is arranged at the opening end of the sealing tool, and the opening is closed, so that the oxygen mask and the sealing tool form a gas cavity; the oxygen mask is connected with the oxygen supply unit, and the oxygen supply unit is used for inputting oxygen into the gas cavity through the oxygen mask;
the interface A is connected with a simulated breathing unit through a pipeline, and the simulated breathing unit is used for simulating sinusoidal breathing of a human being; the interface B is provided with a leakage amount adjusting valve, and the leakage amount of the oxygen mask is adjusted by adjusting the opening of the leakage amount adjusting valve; the interface C is connected with a sampling unit, and the sampling unit is used for sampling an air sample in a gas cavity formed by the oxygen mask and the sealing tool and measuring the oxygen concentration of the air sample;
the control unit is used for controlling and logically operating the whole device.
Further, the height simulation unit further includes: the device comprises a pressure sensor, a temperature sensor, an oxygen concentration sensor A, a vacuum pump and an electromagnetic valve;
the pressure sensor and the temperature sensor are both arranged in the height simulation cabin, and the vacuum pump and the electromagnetic valve are both arranged outside the height simulation cabin and are respectively communicated with the inner cavity of the height simulation cabin through pipelines; the oxygen concentration sensor A is arranged on an exhaust gas path of the vacuum pump; the pressure sensor, the temperature sensor, the oxygen concentration sensor A, the vacuum pump and the electromagnetic valve are electrically connected with the control unit;
the control unit is used for controlling the vacuum pump to pump air in the altitude simulation cabin, so that the environmental pressure in the altitude simulation cabin is in a pressure interval corresponding to the high altitude environment required by the test;
the pressure sensor is used for measuring the environmental pressure in the highly-simulated cabin in real time and feeding back the environmental pressure to the control unit; the control unit adjusts the opening of the electromagnetic valve according to the feedback environmental pressure so as to finely adjust the environmental pressure in the height simulation cabin to be a pressure value corresponding to the high-altitude environment required by the test;
the temperature sensor is used for measuring the temperature in the highly-simulated cabin and transmitting the temperature data to the control unit for display;
the oxygen concentration sensor A is used for measuring the oxygen concentration in the air at the oxygen mask and transmitting the oxygen concentration data to the control unit for display.
Further, the oxygen supply unit includes: oxygen cylinder and gas mass flowmeter; the oxygen steel cylinder is connected with the oxygen mask through an oxygen conduit and is further communicated with a gas cavity formed by the oxygen mask and the sealing tool; the oxygen conduit is provided with a gas mass flowmeter, the gas mass flowmeter is electrically connected with the control unit, and the control unit is used for controlling the opening degree of the gas mass flowmeter, so as to adjust the oxygen supply flow entering the gas cavity through the oxygen mask.
Further, the sampling unit includes: a sampling pump, a sample collection cabin and an oxygen concentration sensor B;
an air inlet of the sampling pump is connected with an interface C of the sealing tool through a pipeline, and an air outlet of the sampling pump is connected with an air inlet of the sample collection cabin through a pipeline; the air outlet hole of the sample collection cabin is connected with the oxygen concentration sensor B through a pipeline, and the sampling pump and the oxygen concentration sensor B are electrically connected with the control unit;
the control unit is used for controlling the start and stop of the sampling pump, and the sampling pump is used for collecting an air sample in a gas cavity formed by the oxygen mask and the sealing tool and outputting the air sample to the sample collection cabin;
the oxygen concentration sensor B is used for measuring the oxygen concentration of the air sample in the sample collection cabin and transmitting the oxygen concentration data to the control unit for display.
Further, the simulated breathing unit is electrically connected with the control unit; the control unit is used for controlling the simulated respiration of the simulated respiration unit.
Further, the volume of the sealing tool is 50 milliliters.
Furthermore, the simulated breathing unit adopts a breathing machine.
Further, the control unit adopts a computer.
Further, the oxygen mask is provided with an air breathing hole; the distance between the air extraction point at the tail end of the pipeline of the vacuum pump and the expiration hole of the oxygen mask is not more than 200mm.
Further, the tidal volume adjustment range of the simulated breath is 0.3L-BTPS-1.5L-BTPS, and the adjustment range of the breathing volume per minute is 5 LPM-BTPS-100 LPM-BTPS.
The beneficial effects are that:
(1) The invention can finish the measurement of the oxygen supply flow required by the oxygen mask when the oxygen mask keeps the safety oxygen partial pressure of passengers under different heights, and further obtains the performance code of the oxygen mask.
(2) The invention uses the sealing tool to replace the head die, adjusts the leakage amount of the oxygen mask through the leakage amount adjusting valve, and has the characteristics of simple structure and convenient installation.
(3) According to the invention, the oxygen concentration in the highly-simulated cabin and the oxygen concentration in the gas cavity formed by the oxygen mask and the sealing tool are respectively measured by using the two oxygen concentration sensors, and the interference of the oxygen concentration in the external environment on the oxygen supply performance test of the oxygen mask can be eliminated by monitoring the change of the oxygen concentration in the highly-simulated cabin.
(4) The invention uses the control unit to control the analog height adjustment and the oxygen supply flow adjustment, and has the characteristics of high automation degree, high response speed, good repeatability, high reliability and accuracy.
Drawings
FIG. 1 is a schematic diagram of the composition of the present invention;
the device comprises a 1-oxygen steel bottle, a 2-mass flowmeter, a 3-height simulation cabin, a 4-oxygen mask, a 5-sealing tool, a 6-leakage regulating valve, a 7-pressure sensor, an 8-temperature sensor, a 9-electromagnetic valve, a 10-oxygen concentration sensor A, an 11-vacuum pump, a 12-sampling pump, a 13-sample collection cabin, a 14-oxygen concentration sensor B, a 15-simulation breathing unit and a 16-control unit.
Detailed Description
The invention will now be described in detail by way of example with reference to the accompanying drawings.
The embodiment provides an oxygen supply performance test device for an oxygen mask for an aircraft, referring to fig. 1, including: an oxygen mask 4, a sealing unit, a height simulation unit, a simulated breathing unit 15, an oxygen supply unit, a sampling unit and a control unit 16;
the control unit 16 is used for controlling and logically operating the whole device;
the simulated respiration unit 15 is used for simulating sinusoidal respiration of a human, and the simulated respiration unit 15 is electrically connected with the control unit 16; the control unit 16 is configured to control the simulated respiration of the simulated respiration unit 15; the tidal volume adjusting range of the simulated respiration is 0.3L-BTPS-1.5L-BTPS, the adjusting range of the respiratory volume per minute is 5 LPM-BTPS-100 LPM-BTPS, wherein L is liter, LPM is liter per minute, and BTPS is Body Temperature and Pressure Saturated, namely, the ambient atmospheric pressure of saturated vapor at 37 ℃;
the sealing unit is used for simulating the oral cavity of a human and comprises a sealing tool 5 and a leakage amount regulating valve 6;
one end of the sealing tool 5 is an opening, and the other end is provided with three interfaces communicated with the inner cavity of the sealing tool, wherein the three interfaces are an interface A, an interface B and an interface C respectively; the volume of the sealing tool 5 is 50 milliliters;
the oxygen mask 4 is arranged at the opening end of the sealing tool 5, and the opening is closed, so that the oxygen mask 4 and the sealing tool 5 form a gas cavity; the oxygen mask 4 is used for introducing oxygen into the sealing tool 5; the oxygen mask 4 is provided with a breathing hole;
the interface A is connected with the simulated breathing unit 15 through a pipeline, the interface B is provided with a leakage amount regulating valve 6, and the leakage amount of the oxygen mask 4 is regulated by regulating the opening of the leakage amount regulating valve 6;
the height simulation unit is used for simulating the high-altitude environment of the oxygen supply performance test and comprises the following components: the device comprises a height simulation cabin 3, a pressure sensor 7, a temperature sensor 8, an oxygen concentration sensor A10, a vacuum pump 11 and an electromagnetic valve 9;
the sealing unit and the oxygen mask 4 are both positioned in the altitude simulation cabin 3;
the pressure sensor 7 and the temperature sensor 8 are both arranged in the altitude simulation cabin 3, the vacuum pump 11 and the electromagnetic valve 9 are both arranged outside the altitude simulation cabin 3 and are respectively communicated with the inner cavity of the altitude simulation cabin 3 through pipelines, and the distance between the air extraction point at the tail end of the pipeline of the vacuum pump 11 and the air extraction hole of the oxygen mask 4 is not more than 200mm; the oxygen concentration sensor A10 is arranged on an exhaust gas path of the vacuum pump 11; the pressure sensor 7, the temperature sensor 8, the oxygen concentration sensor A10, the vacuum pump 11 and the electromagnetic valve 9 are electrically connected with the control unit 16;
the control unit 16 is used for controlling the vacuum pump 11 to pump air in the altitude simulation cabin 3, so that the ambient pressure in the altitude simulation cabin 3 is in a pressure interval corresponding to the high altitude environment required by the test;
the pressure sensor 7 is used for measuring the environmental pressure in the altitude simulation cabin 3 in real time and feeding back to the control unit 16; the control unit 16 adjusts the opening of the electromagnetic valve 9 according to the feedback environmental pressure to finely adjust the environmental pressure in the altitude simulation cabin 3 to be a pressure value corresponding to the high altitude environment required by the test;
the temperature sensor 8 is used for measuring the temperature in the altitude simulation cabin 3 and transmitting the temperature data to the control unit 16 for display;
the oxygen concentration sensor A10 is used for measuring the oxygen concentration in the air near the oxygen mask 4 and transmitting the oxygen concentration data to the control unit 16 for display; and the reading of the oxygen concentration sensor a10 must not be greater than 22%;
the oxygen supply unit includes: an oxygen cylinder 1 and a gas mass flowmeter 2; the oxygen steel bottle 1 is connected with the oxygen mask 4 through an oxygen conduit and is further communicated with a gas cavity formed by the oxygen mask 4 and the sealing tool 5; the oxygen conduit is provided with a gas mass flowmeter 2, the gas mass flowmeter 2 is electrically connected with the control unit 16, and the control unit 16 is used for controlling the opening of the gas mass flowmeter 2 so as to adjust the oxygen supply flow entering the gas cavity through the oxygen mask 4;
the sampling unit includes: the sampling device comprises a sampling pump 12, a sample collection cabin 13 and an oxygen concentration sensor B14, wherein an air inlet of the sampling pump 12 is connected with an interface C of the sealing tool 5 through a pipeline, and an air outlet of the sampling pump 12 is connected with an air inlet of the sample collection cabin 13 through a pipeline; the air outlet hole of the sample collection cabin 13 is connected with the oxygen concentration sensor B14 through a pipeline, and the sampling pump 12 and the oxygen concentration sensor B14 are electrically connected with the control unit 16;
the control unit 16 is used for controlling the start and stop of the sampling pump 12, and the sampling pump 12 is used for collecting an air sample in a gas cavity formed by the oxygen mask 4 and the sealing tool 5 and outputting the air sample to the sample collection cabin 13; the start and stop of the sampling pump 12 are linked with the simulated respiration unit 15, the simulated respiration unit 15 can be judged to be in an expiration stage or an inspiration stage through the feedback signal of the simulated respiration unit 15, the power supply of the sampling pump 12 is switched on in the expiration stage, the sampling is started, and the power supply of the sampling pump 12 is switched off in the inspiration stage, so that the sampling is stopped;
the oxygen concentration sensor B14 is configured to measure an oxygen concentration of the air sample in the sample collection chamber 13, and transmit the oxygen concentration data to the control unit 16 for display;
wherein, the control unit 16 adopts a computer, and the simulated breathing unit 15 adopts a breathing machine.
Working principle: according to the regulations of airworthiness, the oxygen concentration content of the gas inhaled by the human body through the oxygen mask 4 varies under different cabin altitude environments, see table 1;
TABLE 1
| Sequence number | Cabin altitude | Minimum oxygen concentration required for inhalation during airworthiness |
| 1 | 15000 feet | 26.17％ |
| 2 | 25000 feet | 35.6％ |
| 3 | 30000 feet | 46.78％ |
| 4 | 40000 feet | 88.98％ |
(1) Example 1: after the oxygen mask 4 is mounted on the sealing tool 5, the opening of the leakage amount adjusting valve 6 is adjusted, and the leakage amount of the oxygen mask 4 is adjusted to a set value, such as 100cc;
the control unit 16 inputs a height value to be simulated, such as 40000 feet, and the control unit 16 controls the operation of the height simulation unit according to the height value, namely, respectively controls the operation of the vacuum pump 11 and the electromagnetic valve 9, so that the environmental pressure of the height simulation cabin 3 is a pressure value corresponding to the high-altitude environment required by the test;
after the environmental pressure of the highly simulated cabin 3 is stable, starting the simulated breathing unit 15 through the control unit 16, and setting the tidal volume of simulated breathing of the simulated breathing unit 15 to be 1.1LPM-BTPS and the breathing volume per minute to be 30LPM-BTPS;
opening a valve of the oxygen steel cylinder 1, and setting the oxygen supply flow of the gas mass flowmeter 2 to be 3.1LPM-NTPD through the control unit 16, wherein the NTPD is Normal Temperature Pressure Dry, namely the dry gas at 21 ℃ and under standard atmospheric pressure;
after three minutes, the start of the sampling pump 12 is controlled by the control unit 16, an air sample in a gas cavity formed by the oxygen mask 4 and the sealing tool 5 is collected, and the oxygen concentration of the air sample is measured by the oxygen concentration sensor B14, wherein the embodiment is 89.3%;
thus, it was shown that at a height of 40000 feet, a tidal volume of 1.1LPM-BTPS, a breathing volume of 30LPM-BTPS per minute, and an oxygen flow rate of 3.1LPM-NTPD for the oxygen mask 4, the concentration of oxygen in the inhalation airway was 89.3%, meeting the minimum concentration of oxygen required for airworthiness, at which time the performance code for the oxygen mask 4 was 3.1 at a height of 40000 feet.
(2) Example 2: after the oxygen mask 4 is mounted on the sealing tool 5, the opening of the leakage amount adjusting valve 6 is adjusted, and the leakage amount of the oxygen mask 4 is adjusted to a set value, such as 100cc;
the control unit 16 inputs a height value to be simulated, such as 30000 feet, and the control unit 16 controls the operation of the height simulation unit according to the height value, namely, respectively controls the operation of the vacuum pump 11 and the electromagnetic valve 9, so that the environmental pressure of the height simulation cabin 3 is a pressure value corresponding to the high-altitude environment required by the test;
after the environmental pressure of the highly simulated cabin 3 is stable, starting the simulated breathing unit 15 through the control unit 16, and setting the tidal volume of simulated breathing of the simulated breathing unit 15 to be 1.1LPM-BTPS and the breathing volume per minute to be 30LPM-BTPS;
opening a valve of the oxygen steel cylinder 1, and setting the oxygen supply flow of the gas mass flowmeter 2 to be 2.2LPM-NTPD through the control unit 16, wherein the NTPD is Normal Temperature Pressure Dry, namely the dry gas at 21 ℃ and under standard atmospheric pressure;
after three minutes, the start of the sampling pump 12 is controlled by the control unit 16, an air sample in a gas cavity formed by the oxygen mask 4 and the sealing tool 5 is collected, and the oxygen concentration of the air sample is measured by the oxygen concentration sensor B14, wherein the embodiment is 47.3%;
thus, it was shown that at a height of 30000 feet, a tidal volume of 1.1LPM-BTPS, a breathing volume of 30LPM-BTPS per minute, and an oxygen flow rate of 2.2LPM-NTPD for the oxygen mask 4, the concentration of oxygen in the inhalation airway was 47.3% meeting the minimum required concentration of oxygen for airworthiness, at which time the performance code for the oxygen mask 4 was 2.2 at a height of 30000 feet.
(3) Example 3: after the oxygen mask 4 is mounted on the sealing tool 5, the opening of the leakage amount adjusting valve 6 is adjusted, and the leakage amount of the oxygen mask 4 is adjusted to a set value, such as 100cc;
the control unit 16 inputs a height value to be simulated, such as 25000 feet, and the control unit 16 controls the operation of the height simulation unit according to the height value, namely, respectively controls the operation of the vacuum pump 11 and the electromagnetic valve 9, so that the environmental pressure of the height simulation cabin 3 is a pressure value corresponding to the high-altitude environment required by the test;
after the environmental pressure of the highly simulated cabin 3 is stable, starting the simulated breathing unit 15 through the control unit 16, and setting the tidal volume of simulated breathing of the simulated breathing unit 15 to be 1.1LPM-BTPS and the breathing volume per minute to be 30LPM-BTPS;
opening a valve of the oxygen steel cylinder 1, and setting the oxygen supply flow of the gas mass flowmeter 2 to be 1.7LPM-NTPD through the control unit 16, wherein the NTPD is Normal Temperature Pressure Dry, namely the dry gas at 21 ℃ and under standard atmospheric pressure;
after three minutes, the start of the sampling pump 12 is controlled by the control unit 16, an air sample in a gas cavity formed by the oxygen mask 4 and the sealing tool 5 is collected, and the oxygen concentration of the air sample is measured by the oxygen concentration sensor B14, wherein the embodiment is 37.6%;
thus, it was shown that at a height of 25000 feet, a tidal volume of 1.1LPM-BTPS, a breathing volume of 30LPM-BTPS per minute, and an oxygen flow rate of 1.7LPM-NTPD for the oxygen mask 4, the concentration of oxygen in the inhalation airway was 37.6%, meeting the minimum oxygen concentration required for airworthiness, at which time the performance code for the oxygen mask 4 was 1.7 at a height of 25000 feet.
(4) Example 4: after the oxygen mask 4 is mounted on the sealing tool 5, the opening of the leakage amount adjusting valve 6 is adjusted, and the leakage amount of the oxygen mask 4 is adjusted to a set value, such as 100cc;
the control unit 16 inputs a height value to be simulated, such as 15000 feet, and the control unit 16 controls the operation of the height simulation unit according to the height value, namely, respectively controls the operation of the vacuum pump 11 and the electromagnetic valve 9, so that the environmental pressure of the height simulation cabin 3 is a pressure value corresponding to the high-altitude environment required by the test;
after the environmental pressure of the highly simulated cabin 3 is stable, starting the simulated breathing unit 15 through the control unit 16, and setting the tidal volume of simulated breathing of the simulated breathing unit 15 to be 0.7LPM-BTPS and the breathing volume per minute to be 15LPM-BTPS;
opening a valve of the oxygen steel cylinder 1, and setting the oxygen supply flow of the gas mass flowmeter 2 to be 0.5LPM-NTPD through the control unit 16, wherein the NTPD is Normal Temperature Pressure Dry, namely the dry gas at 21 ℃ and under standard atmospheric pressure;
after three minutes, the start of the sampling pump 12 is controlled by the control unit 16, an air sample in a gas cavity formed by the oxygen mask 4 and the sealing tool 5 is collected, and the oxygen concentration of the air sample is measured by the oxygen concentration sensor B14, wherein the embodiment is 27.3%;
thus, it was shown that at a height of 15000 feet, a tidal volume of 0.7LPM-BTPS, a breathing volume of 15LPM-BTPS per minute, and an oxygen flow rate of 0.5LPM-NTPD for the oxygen mask 4, the concentration of oxygen in the inhalation airway was 27.3%, meeting the minimum oxygen concentration required for airworthiness, at which time the performance code for the oxygen mask 4 was 0.5 at a height of 15000 feet.
Finally, it is evident from examples 1-4 that the final performance code of the oxygen mask 4 is 05172231.
In summary, the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. An oxygen supply performance test device for an oxygen mask for an aircraft, comprising: an oxygen mask (4), a sealing unit, a height simulation unit, a simulated breathing unit (15), an oxygen supply unit, a sampling unit and a control unit (16);
the height simulation unit is provided with a height simulation cabin (3) and is used for simulating the high-altitude environment of the oxygen supply performance test in the height simulation cabin (3);
the sealing unit is used for simulating the oral cavity of a human and comprises a sealing tool (5) and a leakage quantity regulating valve (6); the sealing tool (5) and the leakage quantity adjusting valve (6) are both arranged in the height simulation cabin (3); one end of the sealing tool (5) is provided with an opening, the other end of the sealing tool is provided with three interfaces communicated with the inner cavity of the sealing tool, and the three interfaces are an interface A, an interface B and an interface C respectively; the oxygen mask (4) is arranged at the opening end of the sealing tool (5) and seals the opening, so that the oxygen mask (4) and the sealing tool (5) form a gas cavity; the oxygen mask (4) is connected with the oxygen supply unit, and the oxygen supply unit is used for inputting oxygen into the gas cavity through the oxygen mask (4);
the interface A is connected with a simulated breathing unit (15) through a pipeline, and the simulated breathing unit (15) is used for simulating sinusoidal breathing of a human being; the interface B is provided with a leakage amount adjusting valve (6), and the leakage amount of the oxygen mask (4) is adjusted by adjusting the opening of the leakage amount adjusting valve (6); the interface C is connected with a sampling unit, and the sampling unit is used for sampling an air sample in a gas cavity formed by the oxygen mask (4) and the sealing tool (5) and measuring the oxygen concentration of the air sample;
the control unit (16) is used for controlling and logically operating the whole device;
the height simulation unit further includes: a pressure sensor (7), a temperature sensor (8), an oxygen concentration sensor A (10), a vacuum pump (11) and an electromagnetic valve (9);
the pressure sensor (7) and the temperature sensor (8) are both arranged in the height simulation cabin (3), and the vacuum pump (11) and the electromagnetic valve (9) are both arranged outside the height simulation cabin (3) and are respectively communicated with the inner cavity of the height simulation cabin (3) through pipelines; the oxygen concentration sensor A (10) is arranged on an exhaust gas path of the vacuum pump (11); the pressure sensor (7), the temperature sensor (8), the oxygen concentration sensor A (10), the vacuum pump (11) and the electromagnetic valve (9) are electrically connected with the control unit (16);
the control unit (16) is used for controlling the vacuum pump (11) to pump air in the height simulation cabin (3) so that the environmental pressure in the height simulation cabin (3) is in a pressure interval corresponding to the high-altitude environment required by the test;
the pressure sensor (7) is used for measuring the ambient pressure in the altitude simulation cabin (3) in real time and feeding back to the control unit (16); the control unit (16) adjusts the opening of the electromagnetic valve (9) according to the feedback environmental pressure so as to finely adjust the environmental pressure in the height simulation cabin (3) to be a pressure value corresponding to the high-altitude environment required by the test;
the temperature sensor (8) is used for measuring the temperature in the altitude simulation cabin (3) and transmitting the temperature data to the control unit (16) for display;
the oxygen concentration sensor A (10) is used for measuring the oxygen concentration in the air at the oxygen mask (4) and transmitting the oxygen concentration data to the control unit (16) for display.
2. An oxygen supply performance test device for an oxygen mask for an aircraft according to claim 1, wherein the oxygen supply unit comprises: an oxygen steel cylinder (1) and a gas mass flowmeter (2); the oxygen steel bottle (1) is connected with the oxygen mask (4) through an oxygen conduit, and is further communicated with a gas cavity formed by the oxygen mask (4) and the sealing tool (5); the oxygen guide pipe is provided with a gas mass flowmeter (2), the gas mass flowmeter (2) is electrically connected with the control unit (16), and the control unit (16) is used for controlling the opening degree of the gas mass flowmeter (2) so as to adjust the oxygen supply flow entering the gas cavity through the oxygen mask (4).
3. An oxygen supply performance test device for an oxygen mask for an aircraft according to claim 1, wherein the sampling unit comprises: a sampling pump (12), a sample collection chamber (13), and an oxygen concentration sensor B (14);
an air inlet of the sampling pump (12) is connected with an interface C of the sealing tool (5) through a pipeline, and an air outlet of the sampling pump (12) is connected with an air inlet of the sample collection cabin (13) through a pipeline; the air outlet hole of the sample collection cabin (13) is connected with the oxygen concentration sensor B (14) through a pipeline, and the sampling pump (12) and the oxygen concentration sensor B (14) are electrically connected with the control unit (16);
the control unit (16) is used for controlling the start and stop of the sampling pump (12), and the sampling pump (12) is used for collecting an air sample in a gas cavity formed by the oxygen mask (4) and the sealing tool (5) and outputting the air sample to the sample collection cabin (13);
the oxygen concentration sensor B (14) is used for measuring the oxygen concentration of the air sample in the sample collection cabin (13) and transmitting the oxygen concentration data to the control unit (16) for display.
4. An oxygen supply performance test device for an aircraft oxygen mask according to any one of claims 1-3, wherein the simulated breathing unit (15) is electrically connected to the control unit (16); the control unit (16) is used for controlling the simulated respiration of the simulated respiration unit (15).
5. An oxygen supply performance test device for an oxygen mask for an aircraft according to any one of claims 1-3, wherein the sealing tool (5) has a volume of 50 ml.
6. An oxygen supply performance test device for an aircraft oxygen mask according to any one of claims 1-3, characterized in that the simulated breathing unit (15) employs a ventilator.
7. An oxygen supply performance test device for an aircraft oxygen mask according to any one of claims 1-3, characterized in that the control unit (16) employs a computer.
8. An oxygen supply performance test device for an oxygen mask for an aircraft according to any one of claims 1-3, wherein the oxygen mask (4) is provided with an air breathing hole;
the distance between the air extraction point at the tail end of the pipeline of the vacuum pump (11) and the exhalation hole of the oxygen mask (4) is not more than 200mm.
9. The oxygen supply performance test device for the oxygen mask for the airplane according to claim 4, wherein the tidal volume of the simulated breath is adjusted to be in a range of 0.3L-BTPS to 1.5L-BTPS, and the breathing volume per minute is adjusted to be in a range of 5LPM-BTPS to 100LPM-BTPS.
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